[INFO] updating cached repository https://github.com/rschifflin/rust-pubsub
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune", kill_on_drop: false }`
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b07e4f397f298b5bfc7e977b2a18db0a64d010e1
[INFO] testing rschifflin/rust-pubsub against 1.45.2 for beta-1.46-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frschifflin%2Frust-pubsub" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rschifflin/rust-pubsub on toolchain 1.45.2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rschifflin/rust-pubsub
[INFO] finished tweaking git repo https://github.com/rschifflin/rust-pubsub
[INFO] tweaked toml for git repo https://github.com/rschifflin/rust-pubsub written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/rschifflin/rust-pubsub already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.45.2" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9f47201f5af3c0d496b0d3e5f2b54d1b656aba01392c09e536bbea40b1cb1f4d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9f47201f5af3c0d496b0d3e5f2b54d1b656aba01392c09e536bbea40b1cb1f4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f47201f5af3c0d496b0d3e5f2b54d1b656aba01392c09e536bbea40b1cb1f4d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f47201f5af3c0d496b0d3e5f2b54d1b656aba01392c09e536bbea40b1cb1f4d", kill_on_drop: false }`
[INFO] [stdout] 9f47201f5af3c0d496b0d3e5f2b54d1b656aba01392c09e536bbea40b1cb1f4d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1.45.2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 72dd47eebd348ffc62f1a0f4857b93b9ed3f8b16fac1685f62da37a7aeb7253e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "72dd47eebd348ffc62f1a0f4857b93b9ed3f8b16fac1685f62da37a7aeb7253e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling pubsub v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(std_misc)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0369]: cannot add `&[Event<Channel, Payload>]` to `std::vec::Vec<Event<Channel, Payload>>`
[INFO] [stdout]   --> src/lib.rs:49:33
[INFO] [stdout]    |
[INFO] [stdout] 49 |         self.event_queue = head + &*tail;
[INFO] [stdout]    |                            ---- ^ ------ &[Event<Channel, Payload>]
[INFO] [stdout]    |                            |
[INFO] [stdout]    |                            std::vec::Vec<Event<Channel, Payload>>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0369, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0369`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `pubsub`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "72dd47eebd348ffc62f1a0f4857b93b9ed3f8b16fac1685f62da37a7aeb7253e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "72dd47eebd348ffc62f1a0f4857b93b9ed3f8b16fac1685f62da37a7aeb7253e", kill_on_drop: false }`
[INFO] [stdout] 72dd47eebd348ffc62f1a0f4857b93b9ed3f8b16fac1685f62da37a7aeb7253e